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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b9923519a6f65654609279362f350e41c80e663364cad9ed325ede728631e8e' 
  AND token = 'NKP+/WBISE86h75OzVD4qjp3+yane3uXBCLYEyHbKBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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