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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47efb0f6e59397794c4e2e7d907e27fa4e4d724d41181de9c082f4ee524635d7' 
  AND token = '9yAGKMEJ0gtKjYz3qcrVBzOe2E9TovsmCmd0vR3hv9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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