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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adea3483f63e37210797f594ad2486a04ba60d04c0613ef6ba788fbab465364b' 
  AND token = 'YSYeqZSdGsY9M3IV2keB6iCiNNzUecW4PT3DB5pVX+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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