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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '930249d01c7807dc45fd66764e06dd05ad0a721ca878bbe12041c39089c8723a' 
  AND token = 'w9Orgux6qIwpeF6JkQO5kaMrQAM6ftDNe5a36znKdqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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