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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4cf726e2e596726ceca687998e24e54922e97c7b07602d4c4c62b0befcba7b0' 
  AND token = 'E0tLYO7BgcjYR9FuJ5wfEpaRL+sdDADMqay1l2zH61w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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