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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '356e0583eaa3a1d46c5aab96c525e2bc95283c14506ef39716016d46403815ef' 
  AND token = 'gjh8t3YwaRW/Gd98Dq4ptrwaRkMvKUUr7s912Mx0W84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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