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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2794ab42dfc18c814f28daca9407cf50c5c71b6f810896eedadc375997810b0e' 
  AND token = '5CFqiAuN5uJjQS7dHtRB03vAft4j5Qowl8iQ/FkHObg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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