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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f696756261dd0b81c05132bc37f6148961056cc3562922878a5808af3368795a' 
  AND token = 'EMeO4Y10BYHwAZIlm5ZfQDPBnF6de6CKqEplMxaIXQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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