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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea96c963a2b5ad712d6d76e79b1bffd00d63be1c30593784282163e8013561e4' 
  AND token = 'OooKIs0otdTQJbc+XiX5zW6x7BG8BU6EWqiW8p5NWfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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