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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0efc47347382642a10a6bcaa53d2cfb199af2c37692a8aef7cba6d5ae6cee2ce' 
  AND token = 'DQGPmDRjzV5NBsAA+lS8Mw2RdlZWEd3UMV3lOA+/8ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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