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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e71b94d09834f4e3932f6d74e802dd3b372777deb515a9563013d9941be1609' 
  AND token = '/LK6E2vdP4u/+mKUuyEauTU57EIhndLYLgtTT3Y/+RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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