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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98739205d004cf7d462a6a2449ee222266160ce420f08c0d76c519a137702813' 
  AND token = 'q5PeOBE/6TwWKnMoeUT8qt8G6I2ygORR+q/jc40LP9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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