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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bbe316ce7e0e736c589548c7c6944443169c7f5dc0f53336bdeda73f2d91272' 
  AND token = 'JKsAJj07UaXWyI6QtO8p0hi6s/eNoYklqqhY8Sc+aIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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