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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ed328e09fd9516b4d025a6eea3d4b9113df21c162c137192b47ef3b2fe1522' 
  AND token = 'IIAkpf1p0TUz+pk63J4/AQ/itWOfDx+SnLCbgdgL2ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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