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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72d85c577d018f7438284920276166b32c374bc385c15ee76443c7a900cf4d62' 
  AND token = 'F9z8chO/Cp6RE9Pvg/cqdurizUi/S7KXfZZ2WCM+zio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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