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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2085605578b43e4a2bc435232080c64376b4af10f030f77351a4044eaa010c5' 
  AND token = 'y2d12QpRk8etWb3a482/fdS5RYCy6QOMIg5toGkeBt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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