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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6202a53ca5184d649dbbceffe106f16fd5596ad6c04aa765214be7fafd76b4a' 
  AND token = '7bjKrjQroQolCqplInA7ydbyEF2ebMBPzIU+ng/mGbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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