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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73961b207a57c04ec27c643601a6a27bd0bd59879b6231b48aece3eac8d2d5c0' 
  AND token = 'fUIT0c1kmSAUpba8tPo3WS8Bihm+EneL4nFCRlQicH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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