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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb08be5c1c41b3733edd4057b6c15d63e6d73dc4cd930464801591fe1d116db5' 
  AND token = 'oGOhVGnAhZNK7cm32xYTohol16ShegaPo9oF74GUKt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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