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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f16ef396f47a2b5a2795c8bb39b6898a281b8866835109158389d6ec8633ac' 
  AND token = 'dU+dDgMQ8CxQXutpzJbwyBF2ARASmFthAPZPg1oXNxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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