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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e40a21d32203a89e066640c893dfd610f4f4994bb4dbf4eb12f301ea8e7cd7d' 
  AND token = 'pIXFmFeCDtTf7RlmVbDLpKCem+YSIZKKWZWBTlR35d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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