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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e91d7f073e450f2cb768f50b15622836175aa0a7eb7edcf006edb316a0739231' 
  AND token = 'zXpzlWLufMB2HNco081CY9x+bMnrNPbHC/IF0y19CiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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