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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc99a101c5889b8a91fc01129dc6cb8b160a1a4fae9ca4117aeff366963519a0' 
  AND token = '/IkcHnOE4O19N1F7whDuMmeC/Sk/4UW8CuSyYZtUGYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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