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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f5885666acc067a3388ae987ddb3de51a7becd6dcaf71cc82f6b10561e66982' 
  AND token = 'mSPLZ94g1UL+aw26goCguJK8OMAlmB3UElYBdBmKd5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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