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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dfccbf4cd7b1636afb9e355acbd02da94a16cb959e6c8c1ecbb2c47a671be71' 
  AND token = 'rF0TAMGOXwQAG0uqKjHwZCHT5zMfPiFMmSziK+picZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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