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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d623153115c5c1f291f17eea11e2a18a6a37eb2453aa9c01e416f17dc09cf8d' 
  AND token = '1si9OZ/BObi6k29ifwBdTsvWHIpdw7jg7dTkaa79v60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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