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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3f1ab6ea00a1b4a39ef67366c7e3c675b9dfe6fb408f57f92bf11cdc67bed5' 
  AND token = 'lPmeKSJG+cedO0IpKTdzCAQaZ83pRHhV+w4s3Rn+j5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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