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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d81337ff92776c496d23c0a0474372ed766a2f230a60ccc86babbd7c47ef9d6' 
  AND token = 'FoTv8HsQpDcbnzSiTqzN8szyhcF0y9huchiIZH7yjqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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