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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ee86a7d70e249badba30a38d72e4593c25a71acc51c9e16e7e4ea1ac1f8b3d' 
  AND token = 'dNmvWhv3MGhnkfSExAOiRXaW3U7cgvJ8xBl0unUtpfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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