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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64979f61e3ab610b46efed97f605a42f03bdea9a5aad3fdca9d7cbbdc8f42428' 
  AND token = 'Khgz+sQ9Y45fOBo0r6ntPS45s9ICGS4Gglr6/rJFqks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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