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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e8df09aae4360d50d9ee79d77e6a03869604ad9c88323eb993225c6443afdc' 
  AND token = 'h9kyxFfw8ajS5+L9pfOvghvSM62Q53HJW+ue7T5ybb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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