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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94660973089753e7160a8a366a9fc3bbdeb8502ca565c8358758c086cf7c501' 
  AND token = '7LLVVZH7PaC4K6jZlPc9XjbdaqrnS1HoAgmkKNaQfEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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