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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f57fcd1e27065ade78f0ecfcb809d33e4e49e0e874f30414c8a32362e1dbee08' 
  AND token = '43zWpLTi/83hRmKUZ/5k3Yx3rvstyGKooHdTr1U4BzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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