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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ace16907df3cef76636e39dc7c12b315567b16d32b3ff032a7e0a230c430ec' 
  AND token = '1HAiB4znzHHNgpUuqzvKX4SHlcB8QeghLDWknnRWuQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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