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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a1d13d5b44a2fd8017da1c51dac6ac824ded52ad7c24340504996402429309f' 
  AND token = 's73QoW97jF4vyyg7ZmrjEY96tZoyjty2lInRAM6evJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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