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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd66933b838039eae82978a450f19eb098d91c50dd22c722009e5fb26a54dcc44' 
  AND token = '3Jg1yDjDHNToOx5YK7/c8PQhYWUzZrMXxAUEQmcQDbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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