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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1af68736cb14f2266c24a6c2b4b03c63e9c1da0d5070671d8d8ef1440618d98' 
  AND token = 'BvNcDVDkAxTw5vA+IVn6oVoGeQMTG1p61Kgvr1urkko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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