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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d215852e147c0cf9d3a27c3a6caeffffd35f0d2dd0d45615bcf936c0bd74765' 
  AND token = 'UA+vhTtvd8WdzbOfODwXEVm6V92x0r6AJzy0iL5k4f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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