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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40c7f8ac9ebf058100015edcaa8cea1616cf1c7a4cdb534942de0e0abe7d4053' 
  AND token = 's4IFx18Av/1F5XgaXsWSKMp+i5mw6NTSGE1yugGIN6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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