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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5706321f793f5b29843e93e651c703a72c3e167afe2b06d102a86d2d206947b3' 
  AND token = 'umr/I8jOnhtD9jlXjaGvNJO6k7xVxfTsDwEMn78BXTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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