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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9712c71d4c075f5c807ae952fd45a9e4f630e2e75345827266ab8e145a1bca' 
  AND token = '9glS8U3wvMdOrk+H6auwvvphO3FX8Pkp8DMYNbcJb1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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