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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c9bdeb7891fe22159dc29c3cdf4cc755c1cd70b5a23731291caa1e3d34c88f' 
  AND token = 'TBwZFJGuZee7ZE/HsVt+WbfnhLoxSMRqlid2M8md0U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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