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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c4ff7e1ce52cf4a5bef48f6611755a9d2e649c302febf9defd952586ba4f40' 
  AND token = 'kkqIPxQ0wK70sehaNumnOLvUdAyCEZ+2FFOzbVhNb14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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