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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4831f9760914997b2434195a2b9adffc43ae986d32d73762404870db147be9' 
  AND token = 'D0bIB+I2fypW5mKBr80nBdtr4CNpRen7DCEEZ3Mdirs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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