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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aaf8464a9870c3dceffae7a6d7a7d590727847939fb075b764cbd9d34dbac95' 
  AND token = 'thK8N9kiu3z/DPhHUo43c9Vt+z6QVQS/b9yb5ryWm50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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