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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc67dff87531603927195971ae49bea1b34fe6e78177c62a582a0073448b93e8' 
  AND token = 'mpZvl9EOWF4NQ1HVy9X6zATr9fJLp4KCblU3/bzF+Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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