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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5000a055ffbe68d1e56af8f73029a699b815834539814ac5c7c8539cbfcba4f' 
  AND token = 'Od5nd3+FRXMdMACjRM+IudVhPs4LAGchqvoclxHE7Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}