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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5db9d5ccced1105632d83a1e3a7600930ee111f209eef82fedb350e9c7ff6a' 
  AND token = 'MoYJ7U/USMlsT97q5Y1fxupY9uGd8BgVJDAEbLoq8Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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