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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbbd22b4b52910a96bd7ff0833c4587ec40d6aa15756d29950d0b8ba91138688' 
  AND token = '46DMIcmIlcWTsiR+Y9u4Ike/mphSou3RVuKrZd/qzm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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