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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac195ece95f0143d8e0508200ac334cb35cd2356f9fcf90c3e0170b23aff004' 
  AND token = 'bhdK+4+tZwQLL+2n4tEcYFH9oqJLI+JUujU1hb2BP4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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