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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e412da332c0f2dc5695fb92ce5e10ab52784b6044ebd086a06a58d3ebe594d61' 
  AND token = 'iav5BfvQvCcUpSu7iIXYmIjtl7CuRciQAfkC0W4dcCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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