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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8043380f97b6ed1f2e4f6b421e57deb237c8674aed9351e0566cdecbd34614ef' 
  AND token = '9zWINFd0EvuWX0xYetYGaZEUc/htD4iuuJx7f7N0CCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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