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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee8a29aef9d05c9d7f463a53fc213318874b3d4db198c9c339a51dcc9d64da7' 
  AND token = 'cQQBE3Zwt+l+A7giP14KL6rMbsHMPEhoxUABhJdVMYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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