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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a60ff760d701891904a059e6f193c4d70eb37068faa52f1f7ff65d09f32126b' 
  AND token = 'p//xr03Q4IU4901Ba1h0sPby3PktLfhnSM/GGCa4FCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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