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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95091e95bab727ecb58118008b7f48c2ea23b643dbbc5ec78470cd4debbe41d' 
  AND token = 'qZo9iFm2JRcg+Di761BX152NGWpEeZpoXlxvwMvZ4OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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