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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0147a2bf8a0e10704cffdf66658199e5d58fc5c2f1eaa13396439e4e3e38c150' 
  AND token = 'a6+vxkbWn+dHV7GIVr/Lu8+0pe+XCTgTV5CUep8UE+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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