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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72c62b1b5a75014d5f5ed2fac5740e81dc7d8bcc5969b11509b09e7cc578cd7d' 
  AND token = 'oFzSdS79/wQYxA6c0EuSK9mUcWesdwlNaONdMrOsfNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00110

JSON explain

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