SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941cf2bfabac8f6bbfe2a88794d1b5db1b3e28fa56c5376b27f5eff4055713c0' 
  AND token = 'DhDOnOslFpFaWecX2L+tjc6mp6l+meVhz9CwVuYC7zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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