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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99df8dfaad9a7c060e660192256b7deaa6d8bda84259370223470bcc2e9bb37' 
  AND token = 'IOZUdI2EySdR0AwcKaFW7T40jxXrQ16nEC80WpV6nwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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