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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f02f440c3853a41264496317dc124a628f00a16cdca7886bded704992c07091' 
  AND token = 'WM4zq5xH+S+8vCAQ0Xg65yjNBaPJv08bSe/0fty37o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

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