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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1e991d8fc48f2a8ef37dac3796e8029aa84d51bab9498ccf5e2ea17d2ab209' 
  AND token = 'swawuXAN/mj2l3sVGIFHDu61r1N8+R+YfSFXnKKXkKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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